[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / vm86.h

#ifndef _ASM_X86_VM86_H
#define _ASM_X86_VM86_H

#include <asm/ptrace.h>
#include <uapi/asm/vm86.h>

/*
 * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
 * mode - the main change is that the old segment descriptors aren't
 * useful any more and are forced to be zero by the kernel (and the
 * hardware when a trap occurs), and the real segment descriptors are
 * at the end of the structure. Look at ptrace.h to see the "normal"
 * setup. For user space layout see 'struct vm86_regs' above.
 */

struct kernel_vm86_regs {
/*
 * normal regs, with special meaning for the segment descriptors..
 */
	struct pt_regs pt;
/*
 * these are specific to v86 mode:
 */
	unsigned short es, __esh;
	unsigned short ds, __dsh;
	unsigned short fs, __fsh;
	unsigned short gs, __gsh;
};

struct vm86 {
	struct vm86plus_struct __user *vm86_info;
	struct pt_regs regs32;
	unsigned long v86flags;
	unsigned long v86mask;
	unsigned long saved_sp0;

	unsigned long flags;
	unsigned long screen_bitmap;
	unsigned long cpu_type;
	struct revectored_struct int_revectored;
	struct revectored_struct int21_revectored;
	struct vm86plus_info_struct vm86plus;
};

#ifdef CONFIG_VM86

void handle_vm86_fault(struct kernel_vm86_regs *, long);
int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
void save_v86_state(struct kernel_vm86_regs *, int);

struct task_struct;

#define free_vm86(t) do {				\
	struct thread_struct *__t = (t);		\
	if (__t->vm86 != NULL) {			\
		kfree(__t->vm86);			\
		__t->vm86 = NULL;			\
	}						\
} while (0)

/*
 * Support for VM86 programs to request interrupts for
 * real mode hardware drivers:
 */
#define FIRST_VM86_IRQ		 3
#define LAST_VM86_IRQ		15

static inline int invalid_vm86_irq(int irq)
{
	return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
}

void release_vm86_irqs(struct task_struct *);

#else

#define handle_vm86_fault(a, b)
#define release_vm86_irqs(a)

static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
{
	return 0;
}

static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { }

#define free_vm86(t) do { } while(0)

#endif /* CONFIG_VM86 */

#endif /* _ASM_X86_VM86_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_VM86_H
1965aae3 PA	2	#define _ASM_X86_VM86_H
1da177e4	3
6330a30a	4	#include <asm/ptrace.h>
af170c50	5	#include <uapi/asm/vm86.h>
9831bfb2	6
1da177e4 LT	7	/*
	8	* This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
	9	* mode - the main change is that the old segment descriptors aren't
	10	* useful any more and are forced to be zero by the kernel (and the
	11	* hardware when a trap occurs), and the real segment descriptors are
	12	* at the end of the structure. Look at ptrace.h to see the "normal"
	13	* setup. For user space layout see 'struct vm86_regs' above.
	14	*/
	15
	16	struct kernel_vm86_regs {
	17	/*
	18	* normal regs, with special meaning for the segment descriptors..
	19	*/
49d26b6e	20	struct pt_regs pt;
1da177e4 LT	21	/*
	22	* these are specific to v86 mode:
	23	*/
	24	unsigned short es, __esh;
	25	unsigned short ds, __dsh;
	26	unsigned short fs, __fsh;
	27	unsigned short gs, __gsh;
	28	};
	29
9fda6a06 BG	30	struct vm86 {
9fda6a06 BG	31	struct vm86plus_struct __user *vm86_info;
5ed92a8a	32	struct pt_regs regs32;
9fda6a06 BG	33	unsigned long v86flags;
	34	unsigned long v86mask;
	35	unsigned long saved_sp0;
d4ce0f26 BG	36
	37	unsigned long flags;
	38	unsigned long screen_bitmap;
	39	unsigned long cpu_type;
	40	struct revectored_struct int_revectored;
	41	struct revectored_struct int21_revectored;
	42	struct vm86plus_info_struct vm86plus;
9fda6a06 BG	43	};
9fda6a06 BG	44
64ca9004 MM	45	#ifdef CONFIG_VM86
64ca9004 MM	46
1da177e4 LT	47	void handle_vm86_fault(struct kernel_vm86_regs *, long);
1da177e4 LT	48	int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
5ed92a8a	49	void save_v86_state(struct kernel_vm86_regs *, int);
1da177e4	50
64ca9004	51	struct task_struct;
64ca9004	52
9fda6a06 BG	53	#define free_vm86(t) do { \
	54	struct thread_struct *__t = (t); \
	55	if (__t->vm86 != NULL) { \
	56	kfree(__t->vm86); \
	57	__t->vm86 = NULL; \
	58	} \
	59	} while (0)
	60
af3e565a IM	61	/*
	62	* Support for VM86 programs to request interrupts for
	63	* real mode hardware drivers:
	64	*/
	65	#define FIRST_VM86_IRQ 3
	66	#define LAST_VM86_IRQ 15
	67
	68	static inline int invalid_vm86_irq(int irq)
	69	{
	70	return irq < FIRST_VM86_IRQ \|\| irq > LAST_VM86_IRQ;
	71	}
	72
	73	void release_vm86_irqs(struct task_struct *);
	74
64ca9004 MM	75	#else
	76
	77	#define handle_vm86_fault(a, b)
	78	#define release_vm86_irqs(a)
	79
9e8a935b JP	80	static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
9e8a935b JP	81	{
64ca9004 MM	82	return 0;
	83	}
	84
5ed92a8a BG	85	static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { }
5ed92a8a BG	86
9fda6a06 BG	87	#define free_vm86(t) do { } while(0)
9fda6a06 BG	88
64ca9004 MM	89	#endif /* CONFIG_VM86 */
64ca9004 MM	90
1965aae3	91	#endif /* _ASM_X86_VM86_H */